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Winglets & Performance

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galinhdz(at)gmail.com
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Posted: Sun Nov 22, 2009 6:13 pm Post subject: Winglets & Performance

All;

  

 After many flights (2 with new winglets, 2 with old wingtips) at different power settings, I can honestly say there is no significant change in aircraft performance. My numbers show, at best, a maximum 3kt increase in speed with the new winglets based on GPS measured TAS at 1000ft MSL. At 2,400RPM I was getting between 138-139KTAS with the winglets and 136-137KTAS with the old wing tips everything else being equal. Climb performance was not changed at all, that I could measure. I am still getting around 1200fpm climb at MGW, full power from SL to 3,000ft at 100KIAS with either wingtip.

    

 I feel It is not conclusive enough for me to warrant buying the new winglets to replace the old ones. But, since I already have the new winglets, I will keep them on. I did get a tiny increase and to me they do look good. I can tell you I enjoyed doing the test flights and "crunching the numbers" afterwards. It made all the "theory" come alive even if nothing much was found after it was all over. The best part was it gave me something to do while flying instead of just burning holes in the air going nowhere fast.  )

    

 Galin

 N819PR

  [quote][b]

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76papa(at)dishmail.net
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Posted: Mon Nov 23, 2009 4:00 am Post subject: Winglets & Performance

2 to 3 knots is not insignificant in my opinion.  I wonder though if that's accurate since it's very difficult to reproduce the exact atmospheric flying conditions for those tests.  You would have to do numerous tests to verify that.  But if they look good, that's reason enough.



Al



On Nov 22, 2009, at 9:11 PM, Galin Hernandez wrote:

[quote]All;

  

 After many flights (2 with new winglets, 2 with old wingtips) at different power settings, I can honestly say there is no significant change in aircraft performance. My numbers show, at best, a maximum 3kt increase in speed with the new winglets based on GPS measured TAS at 1000ft MSL. At 2,400RPM I was getting between 138-139KTAS with the winglets and 136-137KTAS with the old wing tips everything else being equal. Climb performance was not changed at all, that I could measure. I am still getting around 1200fpm climb at MGW, full power from SL to 3,000ft at 100KIAS with either wingtip.

  

 I feel It is not conclusive enough for me to warrant buying the new winglets to replace the old ones. But, since I already have the new winglets, I will keep them on. I did get a tiny increase and to me they do look good. I can tell you I enjoyed doing the test flights and "crunching the numbers" afterwards. It made all the "theory" come alive even if nothing much was found after it was all over. The best part was it gave me something to do while flying instead of just burning holes in the air going nowhere fast.  )

  

 Galin

 N819PR

  	  Quote: 	
		  

	
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galinhdz(at)gmail.com
Guest

Posted: Mon Nov 23, 2009 5:22 am Post subject: Winglets & Performance

Of course I can't guarantee the 2Kts are accurate. My test equipment is not accurate enough. The 8 sorties (Fly, take numbers, land. Fly again and take more numbers on the same day) gave me the closest possible numbers given my equipment limitations. Best case is 3Kts, worst case is 1Kt. Either way, I don't think it wouldn't justify the costs for the winglets.

  

 Galin

 

 

 On Mon, Nov 23, 2009 at 5:58 AM, Alfred Rosa <76papa(at)dishmail.net (76papa(at)dishmail.net)> wrote:

 [quote] 2 to 3 knots is not insignificant in my opinion.  I wonder though if that's accurate since it's very difficult to reproduce the exact atmospheric flying conditions for those tests.  You would have to do numerous tests to verify that.  But if they look good, that's reason enough.  



 Al

  

  



 

  On Nov 22, 2009, at 9:11 PM, Galin Hernandez wrote:



  	  Quote: 	
		   All;

  

 After many flights (2 with new winglets, 2 with old wingtips) at different power settings, I can honestly say there is no significant change in aircraft performance. My numbers show, at best, a maximum 3kt increase in speed with the new winglets based on GPS measured TAS at 1000ft MSL. At 2,400RPM I was getting between 138-139KTAS with the winglets and 136-137KTAS with the old wing tips everything else being equal. Climb performance was not changed at all, that I could measure. I am still getting around 1200fpm climb at MGW, full power from SL to 3,000ft at 100KIAS with either wingtip.

    

 I feel It is not conclusive enough for me to warrant buying the new winglets to replace the old ones. But, since I already have the new winglets, I will keep them on. I did get a tiny increase and to me they do look good. I can tell you I enjoyed doing the test flights and "crunching the numbers" afterwards. It made all the "theory" come alive even if nothing much was found after it was all over. The best part was it gave me something to do while flying instead of just burning holes in the air going nowhere fast.  )

    

 Galin

 N819PR

 	  Quote: 	
		  

	




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ftyoder(at)yoderbuilt.com
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Posted: Mon Nov 23, 2009 6:21 am Post subject: Winglets & Performance

At least they aren't DRAGLETS!

  

 And you are correct, the look good.

  

 Tim

  

  

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kentpyle(at)iland.net
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Posted: Wed Nov 25, 2009 4:04 pm Post subject: Winglets & Performance

Good report Galin.  I guess I shouldn't feel  bad not having received mine even they are paid for.  Kent

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